propagate cluster error parametrization
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
CommitLineData
e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
7* Permission to use, copy, modify and distribute this software and its *
8* documentation strictly for non-commercial purposes is hereby granted *
9* without fee, provided that the above copyright notice appears in all *
10* copies and that both the copyright notice and this permission notice *
11* appear in the supporting documentation. The authors make no claims *
12* about the suitability of this software for any purpose. It is *
13* provided "as is" without express or implied warranty. *
14**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
bb56afff 28// #include <Riostream.h>
29// #include <stdio.h>
30// #include <string.h>
e4f2f73d 31
32#include <TBranch.h>
bb56afff 33#include <TDirectory.h>
e4f2f73d 34#include <TLinearFitter.h>
e4f2f73d 35#include <TTree.h>
36#include <TClonesArray.h>
e4f2f73d 37#include <TTreeStream.h>
38
39#include "AliLog.h"
40#include "AliESDEvent.h"
bb56afff 41#include "AliGeomManager.h"
e4f2f73d 42#include "AliRieman.h"
43#include "AliTrackPointArray.h"
44
e4f2f73d 45#include "AliTRDgeometry.h"
46#include "AliTRDpadPlane.h"
e4f2f73d 47#include "AliTRDcalibDB.h"
e4f2f73d 48#include "AliTRDReconstructor.h"
49#include "AliTRDCalibraFillHisto.h"
e4f2f73d 50#include "AliTRDrecoParam.h"
bb56afff 51
52#include "AliTRDcluster.h"
e4f2f73d 53#include "AliTRDseedV1.h"
0906e73e 54#include "AliTRDtrackV1.h"
bb56afff 55#include "AliTRDtrackerV1.h"
56#include "AliTRDtrackerDebug.h"
57#include "AliTRDtrackingChamber.h"
58#include "AliTRDchamberTimeBin.h"
59
e4f2f73d 60
e4f2f73d 61
62ClassImp(AliTRDtrackerV1)
eb38ed55 63
64
65const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
66const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
67const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
68const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
69const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 70Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
41702fec 71 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
72 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
73 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e4f2f73d 74};
2985ffcb 75Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 76AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
77TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
78TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 79
80//____________________________________________________________________
3a039a31 81AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 82 :AliTracker()
06b32d95 83 ,fReconstructor(0x0)
41702fec 84 ,fGeom(new AliTRDgeometry())
85 ,fClusters(0x0)
86 ,fTracklets(0x0)
87 ,fTracks(0x0)
88 ,fSieveSeeding(0)
e4f2f73d 89{
41702fec 90 //
91 // Default constructor.
92 //
a7ac01d2 93 AliTRDcalibDB *trd = 0x0;
94 if (!(trd = AliTRDcalibDB::Instance())) {
41702fec 95 AliFatal("Could not get calibration object");
96 }
a7ac01d2 97
98 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 99
053767a4 100 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 101
d611c74f 102 for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0;
d20df6fc 103
3a039a31 104 // Initialize debug stream
06b32d95 105 if(rec) SetReconstructor(rec);
eb38ed55 106}
107
e4f2f73d 108//____________________________________________________________________
109AliTRDtrackerV1::~AliTRDtrackerV1()
110{
41702fec 111 //
112 // Destructor
113 //
114
f7ab3117 115 if(fgRieman) delete fgRieman; fgRieman = 0x0;
116 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0;
117 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0;
d611c74f 118 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 119 if(fTracks) {fTracks->Delete(); delete fTracks;}
120 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 121 if(fClusters) {
122 fClusters->Delete(); delete fClusters;
123 }
41702fec 124 if(fGeom) delete fGeom;
e4f2f73d 125}
126
127//____________________________________________________________________
128Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
129{
41702fec 130 //
131 // Steering stand alone tracking for full TRD detector
132 //
133 // Parameters :
134 // esd : The ESD event. On output it contains
135 // the ESD tracks found in TRD.
136 //
137 // Output :
138 // Number of tracks found in the TRD detector.
139 //
140 // Detailed description
141 // 1. Launch individual SM trackers.
142 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
143 //
144
3a039a31 145 if(!fReconstructor->GetRecoParam() ){
146 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 147 return 0;
148 }
149
150 //AliInfo("Start Track Finder ...");
151 Int_t ntracks = 0;
053767a4 152 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 153 // for(int ism=1; ism<2; ism++){
154 //AliInfo(Form("Processing supermodule %i ...", ism));
155 ntracks += Clusters2TracksSM(ism, esd);
156 }
157 AliInfo(Form("Number of found tracks : %d", ntracks));
158 return ntracks;
e4f2f73d 159}
160
0906e73e 161
162//_____________________________________________________________________________
eb38ed55 163Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 164{
41702fec 165 //AliInfo(Form("Asking for tracklet %d", index));
166
84eab75a 167 // reset position of the point before using it
168 p.SetXYZ(0., 0., 0.);
2f7514a6 169 AliTRDseedV1 *tracklet = GetTracklet(index);
170 if (!tracklet) return kFALSE;
84eab75a 171
41702fec 172 // get detector for this tracklet
84eab75a 173 Int_t idet = tracklet->GetDetector();
41702fec 174
175 Double_t local[3];
176 local[0] = tracklet->GetX0();
177 local[1] = tracklet->GetYfit(0);
178 local[2] = tracklet->GetZfit(0);
179 Double_t global[3];
180 fGeom->RotateBack(idet, local, global);
181 p.SetXYZ(global[0],global[1],global[2]);
182
183
184 // setting volume id
185 AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
053767a4 186 switch (fGeom->GetLayer(idet)) {
41702fec 187 case 0:
188 iLayer = AliGeomManager::kTRD1;
189 break;
190 case 1:
191 iLayer = AliGeomManager::kTRD2;
192 break;
193 case 2:
194 iLayer = AliGeomManager::kTRD3;
195 break;
196 case 3:
197 iLayer = AliGeomManager::kTRD4;
198 break;
199 case 4:
200 iLayer = AliGeomManager::kTRD5;
201 break;
202 case 5:
203 iLayer = AliGeomManager::kTRD6;
204 break;
205 };
053767a4 206 Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet);
41702fec 207 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
208 p.SetVolumeID(volid);
209
210 return kTRUE;
0906e73e 211}
212
eb38ed55 213//____________________________________________________________________
214TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
215{
41702fec 216 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
217 return fgTiltedRieman;
eb38ed55 218}
0906e73e 219
eb38ed55 220//____________________________________________________________________
221TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
222{
41702fec 223 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
224 return fgTiltedRiemanConstrained;
eb38ed55 225}
41702fec 226
eb38ed55 227//____________________________________________________________________
228AliRieman* AliTRDtrackerV1::GetRiemanFitter()
229{
053767a4 230 if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNlayer);
41702fec 231 return fgRieman;
eb38ed55 232}
41702fec 233
0906e73e 234//_____________________________________________________________________________
235Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
236{
41702fec 237 //
238 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
239 // backpropagated by the TPC tracker. Each seed is first propagated
240 // to the TRD, and then its prolongation is searched in the TRD.
241 // If sufficiently long continuation of the track is found in the TRD
242 // the track is updated, otherwise it's stored as originaly defined
243 // by the TPC tracker.
244 //
245
246 // Calibration monitor
247 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
248 if (!calibra) AliInfo("Could not get Calibra instance\n");
249
250 Int_t found = 0; // number of tracks found
251 Float_t foundMin = 20.0;
252
d611c74f 253 Float_t *quality = 0x0;
254 Int_t *index = 0x0;
41702fec 255 Int_t nSeed = event->GetNumberOfTracks();
d611c74f 256 if(nSeed){
257 quality = new Float_t[nSeed];
258 index = new Int_t[nSeed];
259 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
260 AliESDtrack *seed = event->GetTrack(iSeed);
261 Double_t covariance[15];
262 seed->GetExternalCovariance(covariance);
263 quality[iSeed] = covariance[0] + covariance[2];
264 }
265 // Sort tracks according to covariance of local Y and Z
266 TMath::Sort(nSeed,quality,index,kFALSE);
41702fec 267 }
41702fec 268
269 // Backpropagate all seeds
270 Int_t expectedClr;
271 AliTRDtrackV1 track;
272 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
273
274 // Get the seeds in sorted sequence
275 AliESDtrack *seed = event->GetTrack(index[iSeed]);
276
277 // Check the seed status
278 ULong_t status = seed->GetStatus();
279 if ((status & AliESDtrack::kTPCout) == 0) continue;
280 if ((status & AliESDtrack::kTRDout) != 0) continue;
281
282 // Do the back prolongation
283 new(&track) AliTRDtrackV1(*seed);
215f7116 284 track.SetReconstructor(fReconstructor);
285
41702fec 286 //Int_t lbl = seed->GetLabel();
287 //track.SetSeedLabel(lbl);
e4d4864b 288
289 // Make backup and mark entrance in the TRD
76b60503 290 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
291 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
41702fec 292 Float_t p4 = track.GetC();
ae3fbe1f 293 expectedClr = FollowBackProlongation(track);
294
295 if (expectedClr<0) continue; // Back prolongation failed
296
297 if(expectedClr){
d611c74f 298 found++;
41702fec 299 // computes PID for track
300 track.CookPID();
301 // update calibration references using this track
302 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
303 // save calibration object
224f357f 304 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){
305 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
306 calibTrack->SetOwner();
307 seed->AddCalibObject(calibTrack);
308 }
309 //update ESD track
41702fec 310 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 311 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 312 track.UpdateESDtrack(seed);
41702fec 313 }
314 }
315
316 if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
317 //
318 // Make backup for back propagation
319 //
320 Int_t foundClr = track.GetNumberOfClusters();
321 if (foundClr >= foundMin) {
322 //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
323 //track.CookdEdx();
324 //track.CookdEdxTimBin(seed->GetID());
325 track.CookLabel(1. - fgkLabelFraction);
326 if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 327
328 // Sign only gold tracks
329 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
76b60503 330 if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)){
331 //UseClusters(&track);
332 }
41702fec 333 }
334 Bool_t isGold = kFALSE;
335
336 // Full gold track
337 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
338 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
339
340 isGold = kTRUE;
341 }
342
343 // Almost gold track
344 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
345 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
346 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
347
348 isGold = kTRUE;
349 }
350
351 if ((!isGold) && (track.GetBackupTrack())) {
352 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
353 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
354 isGold = kTRUE;
355 }
356 }
357
358 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
359 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
360 //}
361 }
362 }
363
364 // Propagation to the TOF (I.Belikov)
365 if (track.IsStopped() == kFALSE) {
366 Double_t xtof = 371.0;
367 Double_t xTOF0 = 370.0;
368
369 Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
370 if (TMath::Abs(c2) >= 0.99) continue;
371
ae3fbe1f 372 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
41702fec 373
374 // Energy losses taken to the account - check one more time
375 c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
376 if (TMath::Abs(c2) >= 0.99) continue;
377
378 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
379 // fHBackfit->Fill(7);
380 //delete track;
381 // continue;
382 //}
383
384 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
385 Double_t y;
386 track.GetYAt(xtof,GetBz(),y);
387 if (y > ymax) {
388 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
389 }else if (y < -ymax) {
390 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
391 }
392
393 if (track.PropagateTo(xtof)) {
394 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
395 track.UpdateESDtrack(seed);
41702fec 396 }
397 } else {
398 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
399 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
400
401 track.UpdateESDtrack(seed);
41702fec 402 }
403 }
404
405 seed->SetTRDQuality(track.StatusForTOF());
406 seed->SetTRDBudget(track.GetBudget(0));
407 }
d611c74f 408 if(index) delete [] index;
409 if(quality) delete [] quality;
41702fec 410
411
412 AliInfo(Form("Number of seeds: %d", nSeed));
413 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
414
d611c74f 415 // run stand alone tracking
3a039a31 416 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 417
418 return 0;
0906e73e 419}
420
421
422//____________________________________________________________________
423Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
424{
41702fec 425 //
426 // Refits tracks within the TRD. The ESD event is expected to contain seeds
427 // at the outer part of the TRD.
428 // The tracks are propagated to the innermost time bin
429 // of the TRD and the ESD event is updated
430 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
431 //
432
433 Int_t nseed = 0; // contor for loaded seeds
434 Int_t found = 0; // contor for updated TRD tracks
435
436
437 AliTRDtrackV1 track;
438 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
439 AliESDtrack *seed = event->GetTrack(itrack);
440 new(&track) AliTRDtrackV1(*seed);
441
442 if (track.GetX() < 270.0) {
443 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
444 continue;
445 }
446
447 ULong_t status = seed->GetStatus();
e4d4864b 448 // reject tracks which failed propagation in the TRD
41702fec 449 if((status & AliESDtrack::kTRDout) == 0) continue;
e4d4864b 450
451 // reject tracks which are produced by the TRD stand alone track finder.
452 if((status & AliESDtrack::kTRDin) == 0) continue;
41702fec 453 nseed++;
454
455 track.ResetCovariance(50.0);
456
457 // do the propagation and processing
458 Bool_t kUPDATE = kFALSE;
459 Double_t xTPC = 250.0;
460 if(FollowProlongation(track)){
461 // Prolongate to TPC
462 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
463 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
464 found++;
465 kUPDATE = kTRUE;
466 }
467 }
468
469 // Prolongate to TPC without update
470 if(!kUPDATE) {
471 AliTRDtrackV1 tt(*seed);
472 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
473 }
474 }
475 AliInfo(Form("Number of loaded seeds: %d",nseed));
476 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
477
478 return 0;
0906e73e 479}
480
0906e73e 481//____________________________________________________________________
482Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
483{
41702fec 484 // Extrapolates the TRD track in the TPC direction.
485 //
486 // Parameters
487 // t : the TRD track which has to be extrapolated
488 //
489 // Output
490 // number of clusters attached to the track
491 //
492 // Detailed description
493 //
494 // Starting from current radial position of track <t> this function
495 // extrapolates the track through the 6 TRD layers. The following steps
496 // are being performed for each plane:
497 // 1. prepare track:
498 // a. get plane limits in the local x direction
499 // b. check crossing sectors
500 // c. check track inclination
501 // 2. search tracklet in the tracker list (see GetTracklet() for details)
502 // 3. evaluate material budget using the geo manager
503 // 4. propagate and update track using the tracklet information.
504 //
505 // Debug level 2
506 //
507
508 Int_t nClustersExpected = 0;
509 Int_t lastplane = 5; //GetLastPlane(&t);
510 for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
511 Int_t index = 0;
512 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
513 if(!tracklet) continue;
514 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
515
516 Double_t x = tracklet->GetX0();
517 // reject tracklets which are not considered for inward refit
518 if(x > t.GetX()+fgkMaxStep) continue;
519
520 // append tracklet to track
521 t.SetTracklet(tracklet, index);
522
523 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
524 if (!AdjustSector(&t)) break;
525
526 // Start global position
527 Double_t xyz0[3];
528 t.GetXYZ(xyz0);
529
530 // End global position
531 Double_t alpha = t.GetAlpha(), y, z;
532 if (!t.GetProlongation(x,y,z)) break;
533 Double_t xyz1[3];
534 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
535 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
536 xyz1[2] = z;
537
51a23065 538 Double_t length = TMath::Sqrt(
539 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
540 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
541 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
542 );
543 if(length>0.){
544 // Get material budget
545 Double_t param[7];
546 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
547 Double_t xrho= param[0]*param[4];
548 Double_t xx0 = param[1]; // Get mean propagation parameters
549
550 // Propagate and update
551 t.PropagateTo(x, xx0, xrho);
552 if (!AdjustSector(&t)) break;
553 }
41702fec 554
555 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
556 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
557 nClustersExpected += tracklet->GetN();
558 }
559 }
560
3a039a31 561 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 562 Int_t index;
51a23065 563 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 564 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
565 if(!tracklet) continue;
566 t.SetTracklet(tracklet, index);
567 }
568
569 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
29f95561 570 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 571 cstreamer << "FollowProlongation"
572 << "EventNumber=" << eventNumber
573 << "ncl=" << nClustersExpected
574 //<< "track.=" << &t
575 << "\n";
576 }
577
578 return nClustersExpected;
0906e73e 579
580}
581
582//_____________________________________________________________________________
583Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
584{
41702fec 585 // Extrapolates the TRD track in the TOF direction.
586 //
587 // Parameters
588 // t : the TRD track which has to be extrapolated
589 //
590 // Output
591 // number of clusters attached to the track
592 //
593 // Detailed description
594 //
595 // Starting from current radial position of track <t> this function
596 // extrapolates the track through the 6 TRD layers. The following steps
597 // are being performed for each plane:
598 // 1. prepare track:
599 // a. get plane limits in the local x direction
600 // b. check crossing sectors
601 // c. check track inclination
602 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
603 // 3. evaluate material budget using the geo manager
604 // 4. propagate and update track using the tracklet information.
605 //
606 // Debug level 2
607 //
608
609 Int_t nClustersExpected = 0;
610 Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
611 AliTRDtrackingChamber *chamber = 0x0;
612
3b57a3f7 613 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 614 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
615 AliTRDseedV1 *tracklets[kNPlanes];
616 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
617 for(Int_t ip = 0; ip < kNPlanes; ip++){
618 tracklets[ip] = t.GetTracklet(ip);
619 t.UnsetTracklet(ip);
620 }
3b57a3f7 621
053767a4 622 // Loop through the TRD layers
623 for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
41702fec 624 // BUILD TRACKLET IF NOT ALREADY BUILT
625 Double_t x = 0., y, z, alpha;
181d2c97 626 ptrTracklet = tracklets[ilayer];
41702fec 627 if(!ptrTracklet){
053767a4 628 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
43d6ad34 629 ptrTracklet->SetReconstructor(fReconstructor);
41702fec 630 alpha = t.GetAlpha();
053767a4 631 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 632
633 if(!fTrSec[sector].GetNChambers()) continue;
634
053767a4 635 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 636
35c24814 637 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
053767a4 638 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 639 Int_t nCandidates = stack >= 0 ? 1 : 2;
640 z -= stack >= 0 ? 0. : 4.;
641
642 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 643 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 644
053767a4 645 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 646
3a039a31 647 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 648
649 x = chamber->GetX();
650
053767a4 651 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
aec26713 652 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
41702fec 653 tracklet.SetPadLength(pp->GetLengthIPad());
ae4e8b84 654 tracklet.SetDetector(chamber->GetDetector());
41702fec 655 tracklet.SetX0(x);
656 if(!tracklet.Init(&t)){
657 t.SetStopped(kTRUE);
658 return nClustersExpected;
659 }
35c24814 660 if(!tracklet.AttachClustersIter(chamber, 1000./*, kTRUE*/)) continue;
41702fec 661 tracklet.Init(&t);
662
3a039a31 663 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 664
665 break;
666 }
76b60503 667 //ptrTracklet->UseClusters();
0e3b9624 668 } else ptrTracklet->Init(&t);
41702fec 669 if(!ptrTracklet->IsOK()){
670 if(x < 1.) continue; //temporary
35c24814 671 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
672 if(!AdjustSector(&t)) return -1/*nClustersExpected*/;
673 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 674 continue;
675 }
676
677 // Propagate closer to the current chamber if neccessary
678 x -= clength;
35c24814 679 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/;
680 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
681 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/;
41702fec 682
683 // load tracklet to the tracker and the track
684 ptrTracklet = SetTracklet(ptrTracklet);
685 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
686
687
688 // Calculate the mean material budget along the path inside the chamber
689 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
690 Double_t xyz0[3]; // entry point
691 t.GetXYZ(xyz0);
692 alpha = t.GetAlpha();
693 x = ptrTracklet->GetX0();
35c24814 694 if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/;
41702fec 695 Double_t xyz1[3]; // exit point
696 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
697 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
698 xyz1[2] = z;
699 Double_t param[7];
83dea92e 700 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return -1;
41702fec 701 // The mean propagation parameters
702 Double_t xrho = param[0]*param[4]; // density*length
703 Double_t xx0 = param[1]; // radiation length
704
705 // Propagate and update track
35c24814 706 if (!t.PropagateTo(x, xx0, xrho)) return -1/*nClustersExpected*/;
707 if (!AdjustSector(&t)) return -1/*nClustersExpected*/;
41702fec 708 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
35c24814 709 if (!t.Update(ptrTracklet, maxChi2)) return -1/*nClustersExpected*/;
ae3fbe1f 710 if (maxChi2<1e+10) {
41702fec 711 nClustersExpected += ptrTracklet->GetN();
712 //t.SetTracklet(&tracklet, index);
713 }
714 // Reset material budget if 2 consecutive gold
053767a4 715 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 716
717 // Make backup of the track until is gold
718 // TO DO update quality check of the track.
719 // consider comparison with fTimeBinsRange
720 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
721 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
722 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
723 //printf("ratio0 %f [> 0.8]\n", ratio0);
724 //printf("ratio1 %f [> 0.6]\n", ratio1);
725 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
726 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
727 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
728 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
729
730 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
731 (ratio0 > 0.8) &&
732 //(ratio1 > 0.6) &&
733 //(ratio0+ratio1 > 1.5) &&
734 (t.GetNCross() == 0) &&
735 (TMath::Abs(t.GetSnp()) < 0.85) &&
736 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
737
053767a4 738 } // end layers loop
41702fec 739
3a039a31 740 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 741 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 742 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
743 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
744 //debugTrack->SetOwner();
745 cstreamer << "FollowBackProlongation"
746 << "EventNumber=" << eventNumber
747 << "ncl=" << nClustersExpected
748 //<< "track.=" << debugTrack
749 << "\n";
750 }
751
752 return nClustersExpected;
0906e73e 753}
754
eb38ed55 755//_________________________________________________________________________
756Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 757 //
758 // Fits a Riemann-circle to the given points without tilting pad correction.
759 // The fit is performed using an instance of the class AliRieman (equations
760 // and transformations see documentation of this class)
761 // Afterwards all the tracklets are Updated
762 //
763 // Parameters: - Array of tracklets (AliTRDseedV1)
764 // - Storage for the chi2 values (beginning with direction z)
765 // - Seeding configuration
766 // Output: - The curvature
767 //
768 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
769 fitter->Reset();
770 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
771 Int_t *ppl = &allplanes[0];
772 Int_t maxLayers = 6;
773 if(planes){
774 maxLayers = 4;
775 ppl = planes;
776 }
777 for(Int_t il = 0; il < maxLayers; il++){
778 if(!tracklets[ppl[il]].IsOK()) continue;
779 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
780 }
781 fitter->Update();
782 // Set the reference position of the fit and calculate the chi2 values
783 memset(chi2, 0, sizeof(Double_t) * 2);
784 for(Int_t il = 0; il < maxLayers; il++){
785 // Reference positions
786 tracklets[ppl[il]].Init(fitter);
787
788 // chi2
789 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
790 chi2[0] += tracklets[ppl[il]].GetChi2Y();
791 chi2[1] += tracklets[ppl[il]].GetChi2Z();
792 }
793 return fitter->GetC();
eb38ed55 794}
795
796//_________________________________________________________________________
797void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
798{
41702fec 799 //
800 // Performs a Riemann helix fit using the seedclusters as spacepoints
801 // Afterwards the chi2 values are calculated and the seeds are updated
802 //
803 // Parameters: - The four seedclusters
804 // - The tracklet array (AliTRDseedV1)
805 // - The seeding configuration
806 // - Chi2 array
807 //
808 // debug level 2
809 //
810 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
811 fitter->Reset();
812 for(Int_t i = 0; i < 4; i++)
813 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
814 fitter->Update();
815
816
817 // Update the seed and calculated the chi2 value
818 chi2[0] = 0; chi2[1] = 0;
819 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
820 // chi2
821 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
822 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
823 }
eb38ed55 824}
825
826
827//_________________________________________________________________________
828Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
829{
41702fec 830 //
831 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
832 // assumed that the vertex position is set to 0.
833 // This method is very usefull for high-pt particles
834 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
835 // x0, y0: Center of the circle
836 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
837 // zc: center of the pad row
838 // Equation which has to be fitted (after transformation):
839 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
840 // Transformation:
841 // t = 1/(x^2 + y^2)
842 // u = 2 * x * t
843 // v = 2 * x * tan(phiT) * t
844 // Parameters in the equation:
845 // a = -1/y0, b = x0/y0, e = dz/dx
846 //
847 // The Curvature is calculated by the following equation:
848 // - curv = a/Sqrt(b^2 + 1) = 1/R
849 // Parameters: - the 6 tracklets
850 // - the Vertex constraint
851 // Output: - the Chi2 value of the track
852 //
853 // debug level 5
854 //
855
856 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
857 fitter->StoreData(kTRUE);
858 fitter->ClearPoints();
859 AliTRDcluster *cl = 0x0;
860
861 Float_t x, y, z, w, t, error, tilt;
862 Double_t uvt[2];
863 Int_t nPoints = 0;
053767a4 864 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
865 if(!tracklets[ilr].IsOK()) continue;
41702fec 866 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
053767a4 867 if(!tracklets[ilr].IsUsable(itb)) continue;
868 cl = tracklets[ilr].GetClusters(itb);
41702fec 869 x = cl->GetX();
870 y = cl->GetY();
871 z = cl->GetZ();
053767a4 872 tilt = tracklets[ilr].GetTilt();
41702fec 873 // Transformation
874 t = 1./(x * x + y * y);
875 uvt[0] = 2. * x * t;
876 uvt[1] = 2. * x * t * tilt ;
877 w = 2. * (y + tilt * (z - zVertex)) * t;
878 error = 2. * 0.2 * t;
879 fitter->AddPoint(uvt, w, error);
880 nPoints++;
881 }
882 }
883 fitter->Eval();
884
885 // Calculate curvature
886 Double_t a = fitter->GetParameter(0);
887 Double_t b = fitter->GetParameter(1);
888 Double_t curvature = a/TMath::Sqrt(b*b + 1);
889
890 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
891 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
892 tracklets[ip].SetCC(curvature);
893
3a039a31 894/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 895 //Linear Model on z-direction
896 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
897 Double_t slope = fitter->GetParameter(2);
898 Double_t zref = slope * xref;
899 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
900 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
901 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 902 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 903 treeStreamer << "FitTiltedRiemanConstraint"
904 << "EventNumber=" << eventNumber
905 << "CandidateNumber=" << candidateNumber
906 << "Curvature=" << curvature
907 << "Chi2Track=" << chi2track
908 << "Chi2Z=" << chi2Z
909 << "zref=" << zref
910 << "\n";
3a039a31 911 }*/
41702fec 912 return chi2track;
eb38ed55 913}
914
915//_________________________________________________________________________
916Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
917{
41702fec 918 //
919 // Performs a Riemann fit taking tilting pad correction into account
920 // The equation of a Riemann circle, where the y position is substituted by the
921 // measured y-position taking pad tilting into account, has to be transformed
922 // into a 4-dimensional hyperplane equation
923 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
924 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
925 // zc: center of the pad row
926 // zt: z-position of the track
927 // The z-position of the track is assumed to be linear dependent on the x-position
928 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
929 // Transformation: u = 2 * x * t
930 // v = 2 * tan(phiT) * t
931 // w = 2 * tan(phiT) * (x - xref) * t
932 // t = 1 / (x^2 + ymeas^2)
933 // Parameters: a = -1/y0
934 // b = x0/y0
935 // c = (R^2 -x0^2 - y0^2)/y0
936 // d = offset
937 // e = dz/dx
938 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
939 // results from the simple riemann fit. Afterwards the fit is redone.
940 // The curvature is calculated according to the formula:
941 // curv = a/(1 + b^2 + c*a) = 1/R
942 //
943 // Paramters: - Array of tracklets (connected to the track candidate)
944 // - Flag selecting the error definition
945 // Output: - Chi2 values of the track (in Parameter list)
946 //
947 TLinearFitter *fitter = GetTiltedRiemanFitter();
948 fitter->StoreData(kTRUE);
949 fitter->ClearPoints();
950 AliTRDLeastSquare zfitter;
951 AliTRDcluster *cl = 0x0;
952
953 Double_t xref = CalculateReferenceX(tracklets);
954 Double_t x, y, z, t, tilt, dx, w, we;
955 Double_t uvt[4];
956 Int_t nPoints = 0;
957 // Containers for Least-square fitter
958 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
959 if(!tracklets[ipl].IsOK()) continue;
960 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
961 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
962 if (!tracklets[ipl].IsUsable(itb)) continue;
963 x = cl->GetX();
964 y = cl->GetY();
965 z = cl->GetZ();
966 tilt = tracklets[ipl].GetTilt();
967 dx = x - xref;
968 // Transformation
969 t = 1./(x*x + y*y);
970 uvt[0] = 2. * x * t;
971 uvt[1] = t;
972 uvt[2] = 2. * tilt * t;
973 uvt[3] = 2. * tilt * dx * t;
974 w = 2. * (y + tilt*z) * t;
975 // error definition changes for the different calls
976 we = 2. * t;
977 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
978 fitter->AddPoint(uvt, w, we);
979 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
980 nPoints++;
981 }
982 }
983 fitter->Eval();
984 zfitter.Eval();
985
986 Double_t offset = fitter->GetParameter(3);
987 Double_t slope = fitter->GetParameter(4);
988
989 // Linear fitter - not possible to make boundaries
990 // Do not accept non possible z and dzdx combinations
991 Bool_t acceptablez = kTRUE;
992 Double_t zref = 0.0;
993 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
994 if(!tracklets[iLayer].IsOK()) continue;
995 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
996 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
997 acceptablez = kFALSE;
998 }
999 if (!acceptablez) {
1000 Double_t dzmf = zfitter.GetFunctionParameter(1);
1001 Double_t zmf = zfitter.GetFunctionValue(&xref);
1002 fgTiltedRieman->FixParameter(3, zmf);
1003 fgTiltedRieman->FixParameter(4, dzmf);
1004 fitter->Eval();
1005 fitter->ReleaseParameter(3);
1006 fitter->ReleaseParameter(4);
1007 offset = fitter->GetParameter(3);
1008 slope = fitter->GetParameter(4);
1009 }
1010
1011 // Calculate Curvarture
1012 Double_t a = fitter->GetParameter(0);
1013 Double_t b = fitter->GetParameter(1);
1014 Double_t c = fitter->GetParameter(2);
1015 Double_t curvature = 1.0 + b*b - c*a;
1016 if (curvature > 0.0)
1017 curvature = a / TMath::Sqrt(curvature);
1018
1019 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1020
1021 // Update the tracklets
1022 Double_t dy, dz;
1023 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1024
1025 x = tracklets[iLayer].GetX0();
1026 y = 0;
1027 z = 0;
1028 dy = 0;
1029 dz = 0;
1030
1031 // y: R^2 = (x - x0)^2 + (y - y0)^2
1032 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1033 // R = Sqrt() = 1/Curvature
1034 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1035 Double_t res = (x * a + b); // = (x - x0)/y0
1036 res *= res;
1037 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1038 if (res >= 0) {
1039 res = TMath::Sqrt(res);
1040 y = (1.0 - res) / a;
1041 }
1042
1043 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1044 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1045 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1046 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1047 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1048 Double_t x0 = -b / a;
1049 if (-c * a + b * b + 1 > 0) {
1050 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1051 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1052 if (a < 0) yderiv *= -1.0;
1053 dy = yderiv;
1054 }
1055 }
1056 z = offset + slope * (x - xref);
1057 dz = slope;
1058 tracklets[iLayer].SetYref(0, y);
1059 tracklets[iLayer].SetYref(1, dy);
1060 tracklets[iLayer].SetZref(0, z);
1061 tracklets[iLayer].SetZref(1, dz);
1062 tracklets[iLayer].SetC(curvature);
1063 tracklets[iLayer].SetChi2(chi2track);
1064 }
1065
3a039a31 1066/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1067 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1068 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1069 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1070 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1071 cstreamer << "FitTiltedRieman0"
1072 << "EventNumber=" << eventNumber
1073 << "CandidateNumber=" << candidateNumber
1074 << "xref=" << xref
1075 << "Chi2Z=" << chi2z
1076 << "\n";
3a039a31 1077 }*/
41702fec 1078 return chi2track;
eb38ed55 1079}
1080
3b57a3f7 1081
9e333711 1082//____________________________________________________________________
6e4d4425 1083Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1084{
1085 AliTRDLeastSquare yfitter, zfitter;
1086 AliTRDcluster *cl = 0x0;
1087
1088 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1089 if(!tracklets){
1090 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1091 if(!(tracklet = track->GetTracklet(ipl))) continue;
1092 if(!tracklet->IsOK()) continue;
1093 new(&work[ipl]) AliTRDseedV1(*tracklet);
1094 }
1095 tracklets = &work[0];
1096 }
1097
1098 Double_t xref = CalculateReferenceX(tracklets);
1099 Double_t x, y, z, dx, ye, yr, tilt;
1100 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1101 if(!tracklets[ipl].IsOK()) continue;
1102 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1103 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1104 if (!tracklets[ipl].IsUsable(itb)) continue;
1105 x = cl->GetX();
1106 z = cl->GetZ();
1107 dx = x - xref;
1108 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1109 }
1110 }
1111 zfitter.Eval();
1112 Double_t z0 = zfitter.GetFunctionParameter(0);
1113 Double_t dzdx = zfitter.GetFunctionParameter(1);
1114 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1115 if(!tracklets[ipl].IsOK()) continue;
1116 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1117 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1118 if (!tracklets[ipl].IsUsable(itb)) continue;
1119 x = cl->GetX();
1120 y = cl->GetY();
1121 z = cl->GetZ();
1122 tilt = tracklets[ipl].GetTilt();
1123 dx = x - xref;
1124 yr = y + tilt*(z - z0 - dzdx*dx);
1125 // error definition changes for the different calls
1126 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1127 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1128 yfitter.AddPoint(&dx, yr, ye);
1129 }
1130 }
1131 yfitter.Eval();
1132 Double_t y0 = yfitter.GetFunctionParameter(0);
1133 Double_t dydx = yfitter.GetFunctionParameter(1);
1134 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1135
1136 //update track points array
1137 if(np && points){
1138 Float_t xyz[3];
1139 for(int ip=0; ip<np; ip++){
1140 points[ip].GetXYZ(xyz);
1141 xyz[1] = y0 + dydx * (xyz[0] - xref);
1142 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1143 points[ip].SetXYZ(xyz);
1144 }
1145 }
1146 return chi2;
1147}
1148
1149
3b57a3f7 1150//_________________________________________________________________________
6e4d4425 1151Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1152{
41702fec 1153 //
1154 // Performs a Riemann fit taking tilting pad correction into account
1155 // The equation of a Riemann circle, where the y position is substituted by the
1156 // measured y-position taking pad tilting into account, has to be transformed
1157 // into a 4-dimensional hyperplane equation
1158 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1159 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1160 // zc: center of the pad row
1161 // zt: z-position of the track
1162 // The z-position of the track is assumed to be linear dependent on the x-position
1163 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1164 // Transformation: u = 2 * x * t
1165 // v = 2 * tan(phiT) * t
1166 // w = 2 * tan(phiT) * (x - xref) * t
1167 // t = 1 / (x^2 + ymeas^2)
1168 // Parameters: a = -1/y0
1169 // b = x0/y0
1170 // c = (R^2 -x0^2 - y0^2)/y0
1171 // d = offset
1172 // e = dz/dx
1173 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1174 // results from the simple riemann fit. Afterwards the fit is redone.
1175 // The curvature is calculated according to the formula:
1176 // curv = a/(1 + b^2 + c*a) = 1/R
1177 //
1178 // Paramters: - Array of tracklets (connected to the track candidate)
1179 // - Flag selecting the error definition
1180 // Output: - Chi2 values of the track (in Parameter list)
1181 //
1182 TLinearFitter *fitter = GetTiltedRiemanFitter();
1183 fitter->StoreData(kTRUE);
1184 fitter->ClearPoints();
1185 AliTRDLeastSquare zfitter;
1186 AliTRDcluster *cl = 0x0;
3b57a3f7 1187
1188 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1189 if(!tracklets){
1190 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1191 if(!(tracklet = track->GetTracklet(ipl))) continue;
1192 if(!tracklet->IsOK()) continue;
1193 new(&work[ipl]) AliTRDseedV1(*tracklet);
1194 }
1195 tracklets = &work[0];
1196 }
1197
41702fec 1198 Double_t xref = CalculateReferenceX(tracklets);
1199 Double_t x, y, z, t, tilt, dx, w, we;
1200 Double_t uvt[4];
1201 Int_t nPoints = 0;
1202 // Containers for Least-square fitter
1203 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1204 if(!tracklets[ipl].IsOK()) continue;
1205 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1206 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1207 if (!tracklets[ipl].IsUsable(itb)) continue;
1208 x = cl->GetX();
1209 y = cl->GetY();
1210 z = cl->GetZ();
1211 tilt = tracklets[ipl].GetTilt();
1212 dx = x - xref;
1213 // Transformation
1214 t = 1./(x*x + y*y);
1215 uvt[0] = 2. * x * t;
1216 uvt[1] = t;
1217 uvt[2] = 2. * tilt * t;
1218 uvt[3] = 2. * tilt * dx * t;
1219 w = 2. * (y + tilt*z) * t;
1220 // error definition changes for the different calls
1221 we = 2. * t;
1222 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1223 fitter->AddPoint(uvt, w, we);
1224 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1225 nPoints++;
1226 }
1227 }
aec26713 1228 if(fitter->Eval()) return 1.E10;
1229
41702fec 1230 Double_t z0 = fitter->GetParameter(3);
1231 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1232
1233
1234 // Linear fitter - not possible to make boundaries
1235 // Do not accept non possible z and dzdx combinations
1236 Bool_t accept = kTRUE;
1237 Double_t zref = 0.0;
1238 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1239 if(!tracklets[iLayer].IsOK()) continue;
1240 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1241 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1242 accept = kFALSE;
1243 }
1244 if (!accept) {
41702fec 1245 zfitter.Eval();
3b57a3f7 1246 Double_t dzmf = zfitter.GetFunctionParameter(1);
1247 Double_t zmf = zfitter.GetFunctionValue(&xref);
1248 fitter->FixParameter(3, zmf);
1249 fitter->FixParameter(4, dzmf);
1250 fitter->Eval();
1251 fitter->ReleaseParameter(3);
1252 fitter->ReleaseParameter(4);
1253 z0 = fitter->GetParameter(3); // = zmf ?
1254 dzdx = fitter->GetParameter(4); // = dzmf ?
1255 }
1256
1257 // Calculate Curvature
1258 Double_t a = fitter->GetParameter(0);
1259 Double_t b = fitter->GetParameter(1);
1260 Double_t c = fitter->GetParameter(2);
1261 Double_t y0 = 1. / a;
1262 Double_t x0 = -b * y0;
a015e406 1263 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1264 if(tmp<=0.) return 1.E10;
1265 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1266 Double_t C = 1.0 + b*b - c*a;
1267 if (C > 0.0) C = a / TMath::Sqrt(C);
1268
1269 // Calculate chi2 of the fit
1270 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1271
1272 // Update the tracklets
1273 if(!track){
1274 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1275 x = tracklets[ip].GetX0();
90cf7133 1276 tmp = R*R-(x-x0)*(x-x0);
a015e406 1277 if(tmp <= 0.) continue;
1278 tmp = TMath::Sqrt(tmp);
3b57a3f7 1279
1280 // y: R^2 = (x - x0)^2 + (y - y0)^2
1281 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1282 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1283 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1284 tracklets[ip].SetYref(1, (x - x0) / tmp);
1285 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1286 tracklets[ip].SetZref(1, dzdx);
1287 tracklets[ip].SetC(C);
1288 tracklets[ip].SetChi2(chi2);
1289 }
1290 }
3b57a3f7 1291 //update track points array
1292 if(np && points){
1293 Float_t xyz[3];
1294 for(int ip=0; ip<np; ip++){
1295 points[ip].GetXYZ(xyz);
3cfaffa4 1296 xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt(R*R-(xyz[0]-x0)*(xyz[0]-x0));
3b57a3f7 1297 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1298 points[ip].SetXYZ(xyz);
1299 }
1300 }
1301
3b57a3f7 1302 return chi2;
1303}
1304
1305
1bf51039 1306//____________________________________________________________________
1307Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1308{
1309// Kalman filter implementation for the TRD.
1310// It returns the positions of the fit in the array "points"
1311//
1312// Author : A.Bercuci@gsi.de
1313
3cfaffa4 1314 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1315
1316 //prepare marker points along the track
1317 Int_t ip = np ? 0 : 1;
1318 while(ip<np){
1319 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1320 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1321 ip++;
1322 }
1323 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1324
1325
1326 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1327
1328 //Loop through the TRD planes
1329 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1330 // GET TRACKLET OR BUILT IT
1331 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1332 if(tracklets){
1333 if(!(ptrTracklet = &tracklets[iplane])) continue;
1334 }else{
1335 if(!(ptrTracklet = track->GetTracklet(iplane))){
1336 /*AliTRDtrackerV1 *tracker = 0x0;
1337 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1338 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1339 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1340 continue;
1341 }
1342 }
1343 if(!ptrTracklet->IsOK()) continue;
1344
1345 Double_t x = ptrTracklet->GetX0();
1346
1347 while(ip < np){
1348 //don't do anything if next marker is after next update point.
1349 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1350 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1351
1352 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1353 track->GetXYZ(xyz);
1354 track->Global2LocalPosition(xyz, track->GetAlpha());
1355 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1356 ip++;
1357 }
3cfaffa4 1358 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1359
3cfaffa4 1360 // Propagate closer to the next update point
1bf51039 1361 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1362
1363 if(!AdjustSector(track)) return -1;
1364 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1365
1366 //load tracklet to the tracker and the track
1367/* Int_t index;
1368 if((index = FindTracklet(ptrTracklet)) < 0){
1369 ptrTracklet = SetTracklet(&tracklet);
1370 index = fTracklets->GetEntriesFast()-1;
1371 }
1372 track->SetTracklet(ptrTracklet, index);*/
1373
1374
1375 // register tracklet to track with tracklet creation !!
1376 // PropagateBack : loaded tracklet to the tracker and update index
1377 // RefitInward : update index
1378 // MakeTrack : loaded tracklet to the tracker and update index
1379 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1380
1381
1382 //Calculate the mean material budget along the path inside the chamber
1383 Double_t xyz0[3]; track->GetXYZ(xyz0);
1384 Double_t alpha = track->GetAlpha();
1385 Double_t xyz1[3], y, z;
1386 if(!track->GetProlongation(x, y, z)) return -1;
1387 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1388 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1389 xyz1[2] = z;
3cfaffa4 1390 if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position
1bf51039 1391 Double_t param[7];
3cfaffa4 1392 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1393 Double_t xrho = param[0]*param[4]; // density*length
1394 Double_t xx0 = param[1]; // radiation length
1395
1396 //Propagate the track
1397 track->PropagateTo(x, xx0, xrho);
1398 if (!AdjustSector(track)) break;
1399
1400 //Update track
1401 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1402 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1bf51039 1403 if(!up) continue;
1404
1405 //Reset material budget if 2 consecutive gold
1406 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1407 } // end planes loop
1408
1409 // extrapolation
1410 while(ip < np){
1411 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1412
1413 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1414 track->GetXYZ(xyz);
1415 track->Global2LocalPosition(xyz, track->GetAlpha());
1416 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1417 ip++;
1418 }
1419
1420 return track->GetChi2();
1421}
3b57a3f7 1422
eb38ed55 1423//_________________________________________________________________________
bb56afff 1424Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1425{
41702fec 1426 //
1427 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1428 // A linear dependence on the x-value serves as a model.
1429 // The parameters are related to the tilted Riemann fit.
1430 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1431 // - the offset for the reference x
1432 // - the slope
1433 // - the reference x position
1434 // Output: - The Chi2 value of the track in z-Direction
1435 //
1436 Float_t chi2Z = 0, nLayers = 0;
053767a4 1437 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1438 if(!tracklets[iLayer].IsOK()) continue;
1439 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1440 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1441 nLayers++;
1442 }
1443 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1444 return chi2Z;
eb38ed55 1445}
1446
bccda319 1447//_____________________________________________________________________________
1448Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1449{
41702fec 1450 //
1451 // Starting from current X-position of track <t> this function
1452 // extrapolates the track up to radial position <xToGo>.
1453 // Returns 1 if track reaches the plane, and 0 otherwise
1454 //
bccda319 1455
41702fec 1456 const Double_t kEpsilon = 0.00001;
bccda319 1457
41702fec 1458 // Current track X-position
1459 Double_t xpos = t.GetX();
bccda319 1460
41702fec 1461 // Direction: inward or outward
1462 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1463
41702fec 1464 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1465
41702fec 1466 Double_t xyz0[3];
1467 Double_t xyz1[3];
1468 Double_t param[7];
1469 Double_t x;
1470 Double_t y;
1471 Double_t z;
bccda319 1472
41702fec 1473 // The next step size
1474 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1475
41702fec 1476 // Get the global position of the starting point
1477 t.GetXYZ(xyz0);
bccda319 1478
41702fec 1479 // X-position after next step
1480 x = xpos + step;
bccda319 1481
41702fec 1482 // Get local Y and Z at the X-position of the next step
1483 if (!t.GetProlongation(x,y,z)) {
1484 return 0; // No prolongation possible
1485 }
bccda319 1486
41702fec 1487 // The global position of the end point of this prolongation step
1488 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1489 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1490 xyz1[2] = z;
bccda319 1491
41702fec 1492 // Calculate the mean material budget between start and
1493 // end point of this prolongation step
83dea92e 1494 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1495
41702fec 1496 // Propagate the track to the X-position after the next step
1497 if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
1498 return 0;
1499 }
bccda319 1500
41702fec 1501 // Rotate the track if necessary
1502 AdjustSector(&t);
bccda319 1503
41702fec 1504 // New track X-position
1505 xpos = t.GetX();
bccda319 1506
41702fec 1507 }
bccda319 1508
41702fec 1509 return 1;
bccda319 1510
1511}
1512
eb38ed55 1513
1514//_____________________________________________________________________________
1515Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1516{
41702fec 1517 //
1518 // Reads AliTRDclusters from the file.
1519 // The names of the cluster tree and branches
1520 // should match the ones used in AliTRDclusterizer::WriteClusters()
1521 //
1522
1523 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1524 TObjArray *clusterArray = new TObjArray(nsize+1000);
1525
1526 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1527 if (!branch) {
1528 AliError("Can't get the branch !");
1529 return 1;
1530 }
1531 branch->SetAddress(&clusterArray);
1532
1533 if(!fClusters){
8ae98148 1534 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1535 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1536 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1537 array->SetOwner(kTRUE);
1538 }
1539
1540 // Loop through all entries in the tree
1541 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1542 Int_t nbytes = 0;
1543 Int_t ncl = 0;
1544 AliTRDcluster *c = 0x0;
1545 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1546 // Import the tree
1547 nbytes += clusterTree->GetEvent(iEntry);
1548
1549 // Get the number of points in the detector
1550 Int_t nCluster = clusterArray->GetEntriesFast();
1551 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1552 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1553 c->SetInChamber();
1554 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1555 delete (clusterArray->RemoveAt(iCluster));
1556 }
1557
1558 }
1559 delete clusterArray;
1560
1561 return 0;
eb38ed55 1562}
1563
1564//_____________________________________________________________________________
1565Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1566{
41702fec 1567 //
66f6bfd9 1568 // Fills clusters into TRD tracking sectors
41702fec 1569 //
41702fec 1570
48f8adf3 1571 if(!fReconstructor->IsWritingClusters()){
1572 fClusters = AliTRDReconstructor::GetClusters();
1573 } else {
66f6bfd9 1574 if (ReadClusters(fClusters, cTree)) {
1575 AliError("Problem with reading the clusters !");
1576 return 1;
1577 }
1578 }
1579 SetClustersOwner();
1580
48f8adf3 1581 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1582 AliInfo("No TRD clusters");
41702fec 1583 return 1;
1584 }
66f6bfd9 1585
1586 //Int_t nin =
1587 BuildTrackingContainers();
1588
1589 //Int_t ncl = fClusters->GetEntriesFast();
1590 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1591
1592 return 0;
1593}
1594
1595//_____________________________________________________________________________
1596Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1597{
1598 //
1599 // Fills clusters into TRD tracking sectors
1600 // Function for use in the HLT
1601
1602 if(!clusters || !clusters->GetEntriesFast()){
1603 AliInfo("No TRD clusters");
41702fec 1604 return 1;
1605 }
1606
66f6bfd9 1607 fClusters = clusters;
1608 SetClustersOwner();
1609
1610 //Int_t nin =
1611 BuildTrackingContainers();
1612
1613 //Int_t ncl = fClusters->GetEntriesFast();
1614 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1615
1616 return 0;
1617}
1618
1619
1620//____________________________________________________________________
1621Int_t AliTRDtrackerV1::BuildTrackingContainers()
1622{
1623// Building tracking containers for clusters
1624
1625 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1626 while (icl--) {
1627 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1628 if(c->IsInChamber()) nin++;
1629 Int_t detector = c->GetDetector();
1630 Int_t sector = fGeom->GetSector(detector);
053767a4 1631 Int_t stack = fGeom->GetStack(detector);
1632 Int_t layer = fGeom->GetLayer(detector);
41702fec 1633
053767a4 1634 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1635 }
b0a48c4d 1636
1637 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1638 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1639 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1640 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1641 }
66f6bfd9 1642
1643 return nin;
eb38ed55 1644}
1645
1646
66f6bfd9 1647
0906e73e 1648//____________________________________________________________________
1649void AliTRDtrackerV1::UnloadClusters()
1650{
41702fec 1651 //
1652 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1653 //
0906e73e 1654
41702fec 1655 if(fTracks) fTracks->Delete();
1656 if(fTracklets) fTracklets->Delete();
48f8adf3 1657 if(fClusters){
1658 if(IsClustersOwner()) fClusters->Delete();
1659
1660 // save clusters array in the reconstructor for further use.
1661 if(!fReconstructor->IsWritingClusters()){
1662 AliTRDReconstructor::SetClusters(fClusters);
1663 SetClustersOwner(kFALSE);
1664 } else AliTRDReconstructor::SetClusters(0x0);
1665 }
0906e73e 1666
053767a4 1667 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1668
41702fec 1669 // Increment the Event Number
1670 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1671}
0906e73e 1672
eb38ed55 1673//_____________________________________________________________________________
1674Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1675{
41702fec 1676 //
1677 // Rotates the track when necessary
1678 //
1679
1680 Double_t alpha = AliTRDgeometry::GetAlpha();
1681 Double_t y = track->GetY();
1682 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1683
41702fec 1684 if (y > ymax) {
1685 if (!track->Rotate( alpha)) {
1686 return kFALSE;
1687 }
1688 }
1689 else if (y < -ymax) {
1690 if (!track->Rotate(-alpha)) {
1691 return kFALSE;
1692 }
1693 }
1694
1695 return kTRUE;
0906e73e 1696
1697}
1698
eb38ed55 1699
0906e73e 1700//____________________________________________________________________
1701AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1702{
41702fec 1703 // Find tracklet for TRD track <track>
1704 // Parameters
1705 // - track
1706 // - sector
1707 // - plane
1708 // - index
1709 // Output
1710 // tracklet
1711 // index
1712 // Detailed description
1713 //
1714 idx = track->GetTrackletIndex(p);
1715 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1716
1717 return tracklet;
0906e73e 1718}
1719
1720//____________________________________________________________________
3b57a3f7 1721AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1722{
41702fec 1723 // Add this tracklet to the list of tracklets stored in the tracker
1724 //
1725 // Parameters
1726 // - tracklet : pointer to the tracklet to be added to the list
1727 //
1728 // Output
1729 // - the index of the new tracklet in the tracker tracklets list
1730 //
1731 // Detailed description
1732 // Build the tracklets list if it is not yet created (late initialization)
1733 // and adds the new tracklet to the list.
1734 //
1735 if(!fTracklets){
053767a4 1736 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1737 fTracklets->SetOwner(kTRUE);
1738 }
1739 Int_t nentries = fTracklets->GetEntriesFast();
1740 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1741}
1742
d20df6fc 1743//____________________________________________________________________
1744AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1745{
1746 // Add this track to the list of tracks stored in the tracker
1747 //
1748 // Parameters
1749 // - track : pointer to the track to be added to the list
1750 //
1751 // Output
1752 // - the pointer added
1753 //
1754 // Detailed description
1755 // Build the tracks list if it is not yet created (late initialization)
1756 // and adds the new track to the list.
1757 //
1758 if(!fTracks){
053767a4 1759 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1760 fTracks->SetOwner(kTRUE);
1761 }
1762 Int_t nentries = fTracks->GetEntriesFast();
1763 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1764}
1765
1766
0906e73e 1767
e4f2f73d 1768//____________________________________________________________________
eb38ed55 1769Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1770{
41702fec 1771 //
1772 // Steer tracking for one SM.
1773 //
1774 // Parameters :
1775 // sector : Array of (SM) propagation layers containing clusters
1776 // esd : The current ESD event. On output it contains the also
1777 // the ESD (TRD) tracks found in this SM.
1778 //
1779 // Output :
1780 // Number of tracks found in this TRD supermodule.
1781 //
1782 // Detailed description
1783 //
1784 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1785 // 2. Launch stack tracking.
1786 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1787 // 3. Pack results in the ESD event.
1788 //
1789
1790 // allocate space for esd tracks in this SM
1791 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1792 esdTrackList.SetOwner();
1793
1794 Int_t nTracks = 0;
1795 Int_t nChambers = 0;
1796 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1797 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1798 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1799 nChambers = 0;
053767a4 1800 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1801 if(!(chamber = stack[ilayer])) continue;
3a039a31 1802 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1803 nChambers++;
053767a4 1804 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1805 }
1806 if(nChambers < 4) continue;
1807 //AliInfo(Form("Doing stack %d", istack));
1808 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1809 }
1810 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1811
1812 for(int itrack=0; itrack<nTracks; itrack++)
1813 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1814
1815 // Reset Track and Candidate Number
1816 AliTRDtrackerDebug::SetCandidateNumber(0);
1817 AliTRDtrackerDebug::SetTrackNumber(0);
1818 return nTracks;
e4f2f73d 1819}
1820
1821//____________________________________________________________________
eb38ed55 1822Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1823{
41702fec 1824 //
1825 // Make tracks in one TRD stack.
1826 //
1827 // Parameters :
1828 // layer : Array of stack propagation layers containing clusters
1829 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1830 // On exit the tracks found in this stack are appended.
1831 //
1832 // Output :
1833 // Number of tracks found in this stack.
1834 //
1835 // Detailed description
1836 //
1837 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1838 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1839 // See AliTRDtrackerV1::MakeSeeds() for more details.
1840 // 3. Arrange track candidates in decreasing order of their quality
1841 // 4. Classify tracks in 5 categories according to:
1842 // a) number of layers crossed
1843 // b) track quality
1844 // 5. Sign clusters by tracks in decreasing order of track quality
1845 // 6. Build AliTRDtrack out of seeding tracklets
1846 // 7. Cook MC label
1847 // 8. Build ESD track and register it to the output list
1848 //
1849
b0a48c4d 1850 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1851 AliTRDtrackingChamber *chamber = 0x0;
1852 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1853 Int_t pars[4]; // MakeSeeds parameters
1854
1855 //Double_t alpha = AliTRDgeometry::GetAlpha();
1856 //Double_t shift = .5 * alpha;
1857 Int_t configs[kNConfigs];
1858
1859 // Build initial seeding configurations
1860 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1861 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1862 AliInfo(Form("Plane config %d %d %d Quality %f"
1863 , configs[0], configs[1], configs[2], quality));
1864 }
d931f2aa 1865
41702fec 1866
1867 // Initialize contors
1868 Int_t ntracks, // number of TRD track candidates
1869 ntracks1, // number of registered TRD tracks/iter
1870 ntracks2 = 0; // number of all registered TRD tracks in stack
1871 fSieveSeeding = 0;
d931f2aa 1872
1873 // Get stack index
1874 Int_t ic = 0; AliTRDtrackingChamber **cIter = &stack[0];
1875 while(ic<kNPlanes && !(*cIter)){ic++; cIter++;}
1876 if(!(*cIter)) return ntracks2;
1877 Int_t istack = fGeom->GetStack((*cIter)->GetDetector());
1878
41702fec 1879 do{
1880 // Loop over seeding configurations
1881 ntracks = 0; ntracks1 = 0;
1882 for (Int_t iconf = 0; iconf<3; iconf++) {
1883 pars[0] = configs[iconf];
1884 pars[1] = ntracks;
d931f2aa 1885 pars[2] = istack;
41702fec 1886 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1887 if(ntracks == kMaxTracksStack) break;
1888 }
3a039a31 1889 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1890
1891 if(!ntracks) break;
1892
1893 // Sort the seeds according to their quality
1894 Int_t sort[kMaxTracksStack];
1895 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1896
1897 // Initialize number of tracks so far and logic switches
1898 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1899 Bool_t signedTrack[kMaxTracksStack];
1900 Bool_t fakeTrack[kMaxTracksStack];
1901 for (Int_t i=0; i<ntracks; i++){
1902 signedTrack[i] = kFALSE;
1903 fakeTrack[i] = kFALSE;
1904 }
1905 //AliInfo("Selecting track candidates ...");
1906
1907 // Sieve clusters in decreasing order of track quality
1908 Double_t trackParams[7];
1909 // AliTRDseedV1 *lseed = 0x0;
1910 Int_t jSieve = 0, candidates;
1911 do{
1912 //AliInfo(Form("\t\tITER = %i ", jSieve));
1913
1914 // Check track candidates
1915 candidates = 0;
1916 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1917 Int_t trackIndex = sort[itrack];
1918 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1919
1920
804bb02e 1921 // Calculate track parameters from tracklets seeds
804bb02e 1922 Int_t ncl = 0;
1923 Int_t nused = 0;
1924 Int_t nlayers = 0;
1925 Int_t findable = 0;
1926 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1927 Int_t jseed = kNPlanes*trackIndex+jLayer;
1928 if(!sseed[jseed].IsOK()) continue;
1929 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1930
1931 sseed[jseed].UpdateUsed();
1932 ncl += sseed[jseed].GetN2();
1933 nused += sseed[jseed].GetNUsed();
1934 nlayers++;
804bb02e 1935 }
1936
41702fec 1937 // Filter duplicated tracks
1938 if (nused > 30){
1939 //printf("Skip %d nused %d\n", trackIndex, nused);
1940 fakeTrack[trackIndex] = kTRUE;
1941 continue;
1942 }
1943 if (Float_t(nused)/ncl >= .25){
1944 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1945 fakeTrack[trackIndex] = kTRUE;
1946 continue;
1947 }
1948
1949 // Classify tracks
1950 Bool_t skip = kFALSE;
1951 switch(jSieve){
1952 case 0:
1953 if(nlayers < 6) {skip = kTRUE; break;}
1954 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1955 break;
1956
1957 case 1:
1958 if(nlayers < findable){skip = kTRUE; break;}
1959 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1960 break;
1961
1962 case 2:
1963 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1964 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1965 break;
1966
1967 case 3:
1968 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1969 break;
1970
1971 case 4:
1972 if (nlayers == 3){skip = kTRUE; break;}
1973 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
1974 break;
1975 }
1976 if(skip){
1977 candidates++;
1978 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
1979 continue;
1980 }
1981 signedTrack[trackIndex] = kTRUE;
1982
41702fec 1983
1984 // Sign clusters
1985 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
be24510a 1986 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
41702fec 1987 Int_t jseed = kNPlanes*trackIndex+jLayer;
1988 if(!sseed[jseed].IsOK()) continue;
1989 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
1990 sseed[jseed].UseClusters();
1991 if(!cl){
90cf7133 1992 ic = 0;
41702fec 1993 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
1994 clusterIndex = sseed[jseed].GetIndexes(ic);
1995 }
1996 }
1997 if(!cl) continue;
1998
1999
2000 // Build track parameters
2001 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
e79f8eb0 2002/* Int_t idx = 0;
41702fec 2003 while(idx<3 && !lseed->IsOK()) {
2004 idx++;
2005 lseed++;
e79f8eb0 2006 }*/
e79f8eb0 2007 Double_t x = lseed->GetX0();// - 3.5;
41702fec 2008 trackParams[0] = x; //NEW AB
e79f8eb0 2009 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2010 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2011 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
41702fec 2012 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
be24510a 2013 trackParams[5] = lseed->GetC();
41702fec 2014 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2015 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2016
3a039a31 2017 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2018 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2019
2020 Int_t nclusters = 0;
2021 AliTRDseedV1 *dseed[6];
804bb02e 2022
2023 // Build track label - what happens if measured data ???
2024 Int_t labels[1000];
2025 Int_t outlab[1000];
2026 Int_t nlab = 0;
d877f55f 2027
2028 Int_t labelsall[1000];
2029 Int_t nlabelsall = 0;
2030 Int_t naccepted = 0;
2031
804bb02e 2032 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2033 Int_t jseed = kNPlanes*trackIndex+iLayer;
2034 dseed[iLayer] = new AliTRDseedV1(sseed[jseed]);
2035 dseed[iLayer]->SetOwner();
2036 nclusters += sseed[jseed].GetN2();
2037 if(!sseed[jseed].IsOK()) continue;
2038 for(int ilab=0; ilab<2; ilab++){
2039 if(sseed[jseed].GetLabels(ilab) < 0) continue;
2040 labels[nlab] = sseed[jseed].GetLabels(ilab);
2041 nlab++;
2042 }
d877f55f 2043
2044 // Cooking label
2045 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
2046 if(!sseed[jseed].IsUsable(itime)) continue;
2047 naccepted++;
2048 Int_t tindex = 0, ilab = 0;
2049 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
2050 labelsall[nlabelsall++] = tindex;
2051 ilab++;
2052 }
2053 }
41702fec 2054 }
804bb02e 2055 Freq(nlab,labels,outlab,kFALSE);
2056 Int_t label = outlab[0];
2057 Int_t frequency = outlab[1];
2058 Freq(nlabelsall,labelsall,outlab,kFALSE);
2059 Int_t label1 = outlab[0];
2060 Int_t label2 = outlab[2];
2061 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
2062
41702fec 2063 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2064 //AliInfo(Form("Number of clusters %d.", nclusters));
2065 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2066 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2067 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2068 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2069 cstreamer << "Clusters2TracksStack"
2070 << "EventNumber=" << eventNumber
2071 << "TrackNumber=" << trackNumber
2072 << "CandidateNumber=" << candidateNumber
2073 << "Iter=" << fSieveSeeding
2074 << "Like=" << fTrackQuality[trackIndex]
2075 << "S0.=" << dseed[0]
2076 << "S1.=" << dseed[1]
2077 << "S2.=" << dseed[2]
2078 << "S3.=" << dseed[3]
2079 << "S4.=" << dseed[4]
2080 << "S5.=" << dseed[5]
2081 << "p0=" << trackParams[0]
2082 << "p1=" << trackParams[1]
2083 << "p2=" << trackParams[2]
2084 << "p3=" << trackParams[3]
2085 << "p4=" << trackParams[4]
2086 << "p5=" << trackParams[5]
2087 << "p6=" << trackParams[6]
2088 << "Label=" << label
2089 << "Label1=" << label1
2090 << "Label2=" << label2
2091 << "FakeRatio=" << fakeratio
2092 << "Freq=" << frequency
2093 << "Ncl=" << ncl
2094 << "NLayers=" << nlayers
2095 << "Findable=" << findable
41702fec 2096 << "NUsed=" << nused
2097 << "\n";
2098 }
2099
2100 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2101 if(!track){
2102 AliWarning("Fail to build a TRD Track.");
2103 continue;
2104 }
76b60503 2105
41702fec 2106 //AliInfo("End of MakeTrack()");
098c3c3d 2107 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2108 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2109 esdTrack->SetLabel(track->GetLabel());
2110 track->UpdateESDtrack(esdTrack);
41702fec 2111 // write ESD-friends if neccessary
3a039a31 2112 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
41702fec 2113 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2114 calibTrack->SetOwner();
098c3c3d 2115 esdTrack->AddCalibObject(calibTrack);
41702fec 2116 }
41702fec 2117 ntracks1++;
2118 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2119 }
2120
2121 jSieve++;
2122 } while(jSieve<5 && candidates); // end track candidates sieve
2123 if(!ntracks1) break;
2124
2125 // increment counters
2126 ntracks2 += ntracks1;
4302c900 2127
2128 if(fReconstructor->IsHLT()) break;
41702fec 2129 fSieveSeeding++;
2130
2131 // Rebuild plane configurations and indices taking only unused clusters into account
2132 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2133 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2134
2135 for(Int_t ip = 0; ip < kNPlanes; ip++){
2136 if(!(chamber = stack[ip])) continue;
b0a48c4d 2137 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2138 }
2139
3a039a31 2140 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2141 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2142 }
2143 } while(fSieveSeeding<10); // end stack clusters sieve
2144
2145
2146
2147 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2148
2149 return ntracks2;
e4f2f73d 2150}
2151
2152//___________________________________________________________________
eb38ed55 2153Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2154{
41702fec 2155 //
2156 // Assign probabilities to chambers according to their
2157 // capability of producing seeds.
2158 //
2159 // Parameters :
2160 //
2161 // layers : Array of stack propagation layers for all 6 chambers in one stack
2162 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2163 // for details) in the decreasing order of their seeding probabilities.
2164 //
2165 // Output :
2166 //
2167 // Return top configuration quality
2168 //
2169 // Detailed description:
2170 //
2171 // To each chamber seeding configuration (see GetSeedingConfig() for
2172 // the list of all configurations) one defines 2 quality factors:
2173 // - an apriori topological quality (see GetSeedingConfig() for details) and
2174 // - a data quality based on the uniformity of the distribution of
2175 // clusters over the x range (time bins population). See CookChamberQA() for details.
2176 // The overall chamber quality is given by the product of this 2 contributions.
2177 //
2178
2179 Double_t chamberQ[kNPlanes];
2180 AliTRDtrackingChamber *chamber = 0x0;
2181 for(int iplane=0; iplane<kNPlanes; iplane++){
2182 if(!(chamber = stack[iplane])) continue;
2183 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2184 }
2185
2186 Double_t tconfig[kNConfigs];
2187 Int_t planes[4];
2188 for(int iconf=0; iconf<kNConfigs; iconf++){
2189 GetSeedingConfig(iconf, planes);
2190 tconfig[iconf] = fgTopologicQA[iconf];
2191 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2192 }
2193
2194 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2195 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2196 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2197 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2198
2199 return tconfig[configs[0]];
e4f2f73d 2200}
2201
2202//____________________________________________________________________
eb38ed55 2203Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2204{
41702fec 2205 //
2206 // Make tracklet seeds in the TRD stack.
2207 //
2208 // Parameters :
2209 // layers : Array of stack propagation layers containing clusters
2210 // sseed : Array of empty tracklet seeds. On exit they are filled.
2211 // ipar : Control parameters:
2212 // ipar[0] -> seeding chambers configuration
2213 // ipar[1] -> stack index
2214 // ipar[2] -> number of track candidates found so far
2215 //
2216 // Output :
2217 // Number of tracks candidates found.
2218 //
2219 // Detailed description
2220 //
2221 // The following steps are performed:
2222 // 1. Select seeding layers from seeding chambers
2223 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2224 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2225 // this order. The parameters controling the range of accepted clusters in
2226 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2227 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2228 // 4. Initialize seeding tracklets in the seeding chambers.
2229 // 5. Filter 0.
2230 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2231 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2232 // 6. Attach clusters to seeding tracklets and find linear approximation of
2233 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2234 // clusters used by current seeds should not exceed ... (25).
2235 // 7. Filter 1.
2236 // All 4 seeding tracklets should be correctly constructed (see
2237 // AliTRDseedV1::AttachClustersIter())
2238 // 8. Helix fit of the seeding tracklets
2239 // 9. Filter 2.
2240 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2241 // 10. Extrapolation of the helix fit to the other 2 chambers:
2242 // a) Initialization of extrapolation tracklet with fit parameters
2243 // b) Helix fit of tracklets
2244 // c) Attach clusters and linear interpolation to extrapolated tracklets
2245 // d) Helix fit of tracklets
2246 // 11. Improve seeding tracklets quality by reassigning clusters.
2247 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2248 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2249 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2250 // 14. Cooking labels for tracklets. Should be done only for MC
2251 // 15. Register seeds.
2252 //
2253
2254 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2255 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2256 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2257 Int_t ncl, mcl; // working variable for looping over clusters
2258 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2259 // chi2 storage
2260 // chi2[0] = tracklet chi2 on the Z direction
2261 // chi2[1] = tracklet chi2 on the R direction
2262 Double_t chi2[4];
2263
e79f8eb0 2264 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2265 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2266 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2267
2268 // this should be data member of AliTRDtrack
2269 Double_t seedQuality[kMaxTracksStack];
2270
2271 // unpack control parameters
2272 Int_t config = ipar[0];
2273 Int_t ntracks = ipar[1];
d931f2aa 2274 Int_t istack = ipar[2];
41702fec 2275 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2276 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2277
2278
41702fec 2279 // Init chambers geometry
41702fec 2280 Double_t hL[kNPlanes]; // Tilting angle
2281 Float_t padlength[kNPlanes]; // pad lenghts
2282 AliTRDpadPlane *pp = 0x0;
2283 for(int iplane=0; iplane<kNPlanes; iplane++){
2284 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2285 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2286 padlength[iplane] = pp->GetLengthIPad();
2287 }
2288
3a039a31 2289 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2290 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2291 }
2292
d931f2aa 2293 // Build seeding layers
d611c74f 2294 ResetSeedTB();
41702fec 2295 Int_t nlayers = 0;
41702fec 2296 for(int isl=0; isl<kNSeedPlanes; isl++){
2297 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2298 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2299 nlayers++;
41702fec 2300 }
1ba638fc 2301 if(nlayers < 4) return ntracks;
41702fec 2302
2303
2304 // Start finding seeds
2305 Double_t cond0[4], cond1[4], cond2[4];
2306 Int_t icl = 0;
d611c74f 2307 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2308 if(!c[3]) continue;
d611c74f 2309 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2310 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2311 //printf("Found c[3] candidates 0 %d\n", ncl);
2312 Int_t jcl = 0;
2313 while(jcl<ncl) {
d611c74f 2314 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2315 if(!c[0]) continue;
2316 Double_t dx = c[3]->GetX() - c[0]->GetX();
2317 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2318 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2319 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2320 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2321 //printf("Found c[0] candidates 1 %d\n", mcl);
2322
2323 Int_t kcl = 0;
2324 while(kcl<mcl) {
d611c74f 2325 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2326 if(!c[1]) continue;
2327 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2328 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2329 //printf("Found c[1] candidate 2 %p\n", c[2]);
2330 if(!c[2]) continue;
2331
2332 // AliInfo("Seeding clusters found. Building seeds ...");
2333 // for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ());
2334
804bb02e 2335 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2336
d611c74f 2337 FitRieman(c, chi2);
2338
d931f2aa 2339 AliTRDseedV1 *tseed = &cseed[0];
2340 AliTRDtrackingChamber **cIter = &stack[0];
2341 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2342 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2343 tseed->SetTilt(hL[iLayer]);
2344 tseed->SetPadLength(padlength[iLayer]);
3a039a31 2345 tseed->SetReconstructor(fReconstructor);
d931f2aa 2346 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2347 tseed->Init(GetRiemanFitter());
2348 }
2349
2350 Bool_t isFake = kFALSE;
3a039a31 2351 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2352 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2353 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2354 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2355
2356 Double_t xpos[4];
2357 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2358 Float_t yref[4];
2359 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2360 Int_t ll = c[3]->GetLabel(0);
2361 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2362 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2363 AliRieman *rim = GetRiemanFitter();
29f95561 2364 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2365 cs0 << "MakeSeeds0"
2366 <<"EventNumber=" << eventNumber
2367 <<"CandidateNumber=" << candidateNumber
2368 <<"isFake=" << isFake
2369 <<"config=" << config
2370 <<"label=" << ll
2371 <<"chi2z=" << chi2[0]
2372 <<"chi2y=" << chi2[1]
2373 <<"Y2exp=" << cond2[0]
2374 <<"Z2exp=" << cond2[1]
2375 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2376 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2377 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2378 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2379 <<"yref0=" << yref[0]
2380 <<"yref1=" << yref[1]
2381 <<"yref2=" << yref[2]
2382 <<"yref3=" << yref[3]
2383 <<"c0.=" << c[0]
2384 <<"c1.=" << c[1]
2385 <<"c2.=" << c[2]
2386 <<"c3.=" << c[3]
2387 <<"Seed0.=" << &cseed[planes[0]]
2388 <<"Seed1.=" << &cseed[planes[1]]
2389 <<"Seed2.=" << &cseed[planes[2]]
2390 <<"Seed3.=" << &cseed[planes[3]]
2391 <<"RiemanFitter.=" << rim
2392 <<"\n";
2393 }
3a039a31 2394 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2395// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2396 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2397 continue;
2398 }
3a039a31 2399 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2400// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2401 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2402 continue;
2403 }
2404 //AliInfo("Passed chi2 filter.");
2405
2406 // try attaching clusters to tracklets
2407 Int_t nUsedCl = 0;
2408 Int_t mlayers = 0;
be24510a 2409 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2410 Int_t jLayer = planes[iLayer];
2411 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2412 nUsedCl += cseed[jLayer].GetNUsed();
2413 if(nUsedCl > 25) break;
2414 mlayers++;
2415 }
be24510a 2416
2417 if(mlayers < kNSeedPlanes){
2418 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2419 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2420 continue;
2421 }
2422
2423 // temporary exit door for the HLT
4302c900 2424 if(fReconstructor->IsHLT()){
be24510a 2425 // attach clusters to extrapolation chambers
2426 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2427 Int_t jLayer = planesExt[iLayer];
2428 if(!(chamber = stack[jLayer])) continue;
2429 cseed[jLayer].AttachClustersIter(chamber, 1000.);
2430 }
4302c900 2431 fTrackQuality[ntracks] = 1.; // dummy value
2432 ntracks++;
218ba867 2433 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2434 cseed += 6;
2435 continue;
2436 }
2437
be24510a 2438
d611c74f 2439 // fit tracklets and cook likelihood
2440 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
91834b8d 2441 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2442
3a039a31 2443 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2444 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2445 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2446 continue;
2447 }
2448 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2449
2450 // book preliminary results
2451 seedQuality[ntracks] = like;
2452 fSeedLayer[ntracks] = config;/*sLayer;*/
2453
2454 // attach clusters to the extrapolation seeds
d611c74f 2455 Int_t nusedf = 0; // debug value
be24510a 2456 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2457 Int_t jLayer = planesExt[iLayer];
d611c74f 2458 if(!(chamber = stack[jLayer])) continue;
d611c74f 2459
2460 // fit extrapolated seed
2461 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2462 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2463 AliTRDseedV1 pseed = cseed[jLayer];
2464 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2465 cseed[jLayer] = pseed;
2466 nusedf += cseed[jLayer].GetNUsed(); // debug value
2467 FitTiltedRieman(cseed, kTRUE);
2468 }
2469
2470 // AliInfo("Extrapolation done.");
2471 // Debug Stream containing all the 6 tracklets
3a039a31 2472 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2473 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2474 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2475 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2476 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2477 cstreamer << "MakeSeeds1"
2478 << "EventNumber=" << eventNumber
2479 << "CandidateNumber=" << candidateNumber
2480 << "S0.=" << &cseed[0]
2481 << "S1.=" << &cseed[1]
2482 << "S2.=" << &cseed[2]
2483 << "S3.=" << &cseed[3]
2484 << "S4.=" << &cseed[4]
2485 << "S5.=" << &cseed[5]
2486 << "FitterT.=" << tiltedRieman
2487 << "\n";
2488 }
2489
fb872574 2490 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2491 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2492 continue;
2493 }
2494 //AliInfo("Improve seed quality done.");
2495
2496 // fit full track and cook likelihoods
2497 // Double_t curv = FitRieman(&cseed[0], chi2);
2498 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2499 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2500
2501 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2502 Double_t chi2Vals[3];
2503 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2504 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2505 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2506 else
2507 chi2Vals[1] = 1.;
2508 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2509 // Chi2 definitions in testing stage
2510 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2511 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2512 //AliInfo("Hyperplane fit done\n");
2513
2514 // finalize tracklets
2515 Int_t labels[12];
2516 Int_t outlab[24];
2517 Int_t nlab = 0;
2518 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2519 if (!cseed[iLayer].IsOK()) continue;
2520
2521 if (cseed[iLayer].GetLabels(0) >= 0) {
2522 labels[nlab] = cseed[iLayer].GetLabels(0);
2523 nlab++;
2524 }
2525
2526 if (cseed[iLayer].GetLabels(1) >= 0) {
2527 labels[nlab] = cseed[iLayer].GetLabels(1);
2528 nlab++;
2529 }
2530 }
2531 Freq(nlab,labels,outlab,kFALSE);
2532 Int_t label = outlab[0];
2533 Int_t frequency = outlab[1];
2534 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2535 cseed[iLayer].SetFreq(frequency);
2536 cseed[iLayer].SetChi2Z(chi2[1]);
2537 }
2538
3a039a31 2539 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2540 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2541 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2542 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2543 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2544 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2545 Int_t ncls = 0;
2546 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2547 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2548 }
d611c74f 2549 cstreamer << "MakeSeeds2"
2550 << "EventNumber=" << eventNumber
2551 << "CandidateNumber=" << candidateNumber
2552 << "Chi2TR=" << chi2Vals[0]
2553 << "Chi2TC=" << chi2Vals[1]
2554 << "Nlayers=" << mlayers
91834b8d 2555 << "NClusters=" << ncls
d611c74f 2556 << "NUsedS=" << nUsedCl
2557 << "NUsed=" << nusedf
2558 << "Like=" << like
2559 << "S0.=" << &cseed[0]
2560 << "S1.=" << &cseed[1]
2561 << "S2.=" << &cseed[2]
2562 << "S3.=" << &cseed[3]
2563 << "S4.=" << &cseed[4]
2564 << "S5.=" << &cseed[5]
2565 << "Label=" << label
2566 << "Freq=" << frequency
2567 << "FitterT.=" << fitterT
2568 << "FitterTC.=" << fitterTC
2569 << "\n";
2570 }
2571
2572 ntracks++;
2573 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2574 if(ntracks == kMaxTracksStack){
2575 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2576 return ntracks;
2577 }
2578 cseed += 6;
41702fec 2579 }
2580 }
2581 }
41702fec 2582
2583 return ntracks;
e4f2f73d 2584}
2585
2586//_____________________________________________________________________________
0906e73e 2587AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2588{
41702fec 2589 //
2590 // Build a TRD track out of tracklet candidates
2591 //
2592 // Parameters :
2593 // seeds : array of tracklets
2594 // params : track parameters (see MakeSeeds() function body for a detailed description)
2595 //
2596 // Output :
2597 // The TRD track.
2598 //
2599 // Detailed description
2600 //
2601 // To be discussed with Marian !!
2602 //
2603
41702fec 2604
2605 Double_t alpha = AliTRDgeometry::GetAlpha();
2606 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2607 Double_t c[15];
2608
2609 c[ 0] = 0.2;
2610 c[ 1] = 0.0; c[ 2] = 2.0;
2611 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2612 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2613 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2614
d20df6fc 2615 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2616 track.PropagateTo(params[0]-5.0);
91834b8d 2617 if(fReconstructor->IsHLT()){
2618 AliTRDseedV1 *ptrTracklet = 0x0;
2619 for(Int_t ip=0; ip<kNPlanes; ip++){
2620 track.UnsetTracklet(ip);
2621 ptrTracklet = SetTracklet(&seeds[ip]);
2622 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2623 }
d78d7df0 2624 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2625 ptrTrack->SetReconstructor(fReconstructor);
2626 return ptrTrack;
91834b8d 2627 }
393fda1c 2628
d20df6fc 2629 track.ResetCovariance(1);
e79f8eb0 2630 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2631 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2632 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2633 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2634 Double_t p[5]; // Track Params for the Debug Stream
2635 track.GetExternalParameters(params[0], p);
29f95561 2636 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2637 cs << "MakeTrack"
2638 << "EventNumber=" << eventNumber
2639 << "CandidateNumber=" << candidateNumber
2640 << "nc=" << nc
2641 << "X=" << params[0]
2642 << "Y=" << p[0]
2643 << "Z=" << p[1]
2644 << "snp=" << p[2]
2645 << "tnd=" << p[3]
2646 << "crv=" << p[4]
2647 << "Yin=" << params[1]
2648 << "Zin=" << params[2]
2649 << "snpin=" << params[3]
2650 << "tndin=" << params[4]
2651 << "crvin=" << params[5]
2652 << "track.=" << &track
2653 << "\n";
2654 }
d20df6fc 2655 if (nc < 30) return 0x0;
2656
2657 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2658 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2659 ptrTrack->CookLabel(.9);
24253b0a 2660
d20df6fc 2661 // computes PID for track
2662 ptrTrack->CookPID();
2663 // update calibration references using this track
48f8adf3 2664 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2665 if (!calibra){
2666 AliInfo("Could not get Calibra instance\n");
2667 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2668 }
d20df6fc 2669 return ptrTrack;
e4f2f73d 2670}
2671
0906e73e 2672
2673//____________________________________________________________________
eb38ed55 2674Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2675{
41702fec 2676 //
2677 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2678 //
2679 // Parameters :
2680 // layers : Array of propagation layers for a stack/supermodule
2681 // cseed : Array of 6 seeding tracklets which has to be improved
2682 //
2683 // Output :
2684 // cssed : Improved seeds
2685 //
2686 // Detailed description
2687 //
2688 // Iterative procedure in which new clusters are searched for each
2689 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2690 // can be maximized. If some optimization is found the old seeds are replaced.
2691 //
2692 // debug level: 7
2693 //
2694
2695 // make a local working copy
2696 AliTRDtrackingChamber *chamber = 0x0;
2697 AliTRDseedV1 bseed[6];
2698 Int_t nLayers = 0;
2699 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2700
2701 Float_t lastquality = 10000.0;
2702 Float_t lastchi2 = 10000.0;
2703 Float_t chi2 = 1000.0;
2704
2705 for (Int_t iter = 0; iter < 4; iter++) {
2706 Float_t sumquality = 0.0;
2707 Float_t squality[6];
2708 Int_t sortindexes[6];
2709
2710 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2711 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2712 sumquality += squality[jLayer];
2713 }
2714 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2715
2716 nLayers = 0;
2717 lastquality = sumquality;
2718 lastchi2 = chi2;
2719 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2720
2721 TMath::Sort(6, squality, sortindexes, kFALSE);
2722 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2723 Int_t bLayer = sortindexes[jLayer];
2724 if(!(chamber = stack[bLayer])) continue;
2725 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2726 if(bseed[bLayer].IsOK()) nLayers++;
2727 }
2728
2729 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2730 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2731 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2732 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2733 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2734 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2735 cstreamer << "ImproveSeedQuality"
2736 << "EventNumber=" << eventNumber
2737 << "CandidateNumber=" << candidateNumber
2738 << "Iteration=" << iter
2739 << "S0.=" << &bseed[0]
2740 << "S1.=" << &bseed[1]
2741 << "S2.=" << &bseed[2]
2742 << "S3.=" << &bseed[3]
2743 << "S4.=" << &bseed[4]
2744 << "S5.=" << &bseed[5]
2745 << "FitterT.=" << tiltedRieman
2746 << "\n";
2747 }
2748 } // Loop: iter
2749
2750 // we are sure that at least 2 tracklets are OK !
2751 return nLayers+2;
e4f2f73d 2752}
2753
eb38ed55 2754//_________________________________________________________________________
2755Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2756 //
2757 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2758 // the track selection
2759 // The likelihood value containes:
2760 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2761 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2762 // For all Parameters an exponential dependency is used
2763 //
2764 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2765 // - Array of chi2 values:
2766 // * Non-Constrained Tilted Riemann fit
2767 // * Vertex-Constrained Tilted Riemann fit
2768 // * z-Direction from Linear fit
2769 // Output: - The calculated track likelihood
2770 //
2771 // debug level 2
2772 //
2773
2774 Double_t sumdaf = 0, nLayers = 0;
2775 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2776 if(!tracklets[iLayer].IsOK()) continue;
2777 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2778 nLayers++;
2779 }
2780 sumdaf /= Float_t (nLayers - 2.0);
2781
2782 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2783 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2784 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2785 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2786 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2787 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2788
3a039a31 2789 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2790 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2791 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2792 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2793 cstreamer << "CalculateTrackLikelihood0"
2794 << "EventNumber=" << eventNumber
2795 << "CandidateNumber=" << candidateNumber
2796 << "LikeChi2Z=" << likeChi2Z
2797 << "LikeChi2TR=" << likeChi2TR
2798 << "LikeChi2TC=" << likeChi2TC
2799 << "LikeAF=" << likeAF
2800 << "TrackLikelihood=" << trackLikelihood
2801 << "\n";
2802 }
2803
2804 return trackLikelihood;
e4f2f73d 2805}
2806
2807//____________________________________________________________________
91834b8d 2808Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2809{
41702fec 2810 //
2811 // Calculate the probability of this track candidate.
2812 //
2813 // Parameters :
2814 // cseeds : array of candidate tracklets
2815 // planes : array of seeding planes (see seeding configuration)
2816 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2817 //
2818 // Output :
2819 // likelihood value
2820 //
2821 // Detailed description
2822 //
2823 // The track quality is estimated based on the following 4 criteria:
2824 // 1. precision of the rieman fit on the Y direction (likea)
2825 // 2. chi2 on the Y direction (likechi2y)
2826 // 3. chi2 on the Z direction (likechi2z)
2827 // 4. number of attached clusters compared to a reference value
2828 // (see AliTRDrecoParam::fkFindable) (likeN)
2829 //
2830 // The distributions for each type of probabilities are given below as of
2831 // (date). They have to be checked to assure consistency of estimation.
2832 //
2833
2834 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2835 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2836
91834b8d 2837 Double_t chi2y = GetChi2Y(&cseed[0]);
2838 Double_t chi2z = GetChi2Z(&cseed[0]);
2839
8ae98148 2840 Float_t nclusters = 0.;
41702fec 2841 Double_t sumda = 0.;
2842 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2843 Int_t jlayer = planes[ilayer];
2844 nclusters += cseed[jlayer].GetN2();
2845 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2846 }
8ae98148 2847 nclusters *= .25;
2848
5a2e200c 2849 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 2850 Double_t likechi2y = 0.0000000001;
5a2e200c 2851 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
2852 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 2853 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2854 Double_t like = likea * likechi2y * likechi2z * likeN;
2855
2856 // AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN));
3a039a31 2857 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2858 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2859 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2860 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2861 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2862 if(!cseed[iseed].IsOK()) continue;
2863 nTracklets++;
2864 mean_ncls += cseed[iseed].GetN2();
2865 }
2866 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2867 // The Debug Stream contains the seed
29f95561 2868 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2869 cstreamer << "CookLikelihood"
2870 << "EventNumber=" << eventNumber
2871 << "CandidateNumber=" << candidateNumber
2872 << "tracklet0.=" << &cseed[0]
2873 << "tracklet1.=" << &cseed[1]
2874 << "tracklet2.=" << &cseed[2]
2875 << "tracklet3.=" << &cseed[3]
2876 << "tracklet4.=" << &cseed[4]
2877 << "tracklet5.=" << &cseed[5]
2878 << "sumda=" << sumda
91834b8d 2879 << "chi2y=" << chi2y
2880 << "chi2z=" << chi2z
41702fec 2881 << "likea=" << likea
2882 << "likechi2y=" << likechi2y
2883 << "likechi2z=" << likechi2z
2884 << "nclusters=" << nclusters
2885 << "likeN=" << likeN
2886 << "like=" << like
91834b8d 2887 << "meanncls=" << mean_ncls
41702fec 2888 << "\n";
2889 }
2890
2891 return like;
e4f2f73d 2892}
2893
e4f2f73d 2894//____________________________________________________________________
0906e73e 2895void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2896{
41702fec 2897 //
2898 // Map seeding configurations to detector planes.
2899 //
2900 // Parameters :
2901 // iconfig : configuration index
2902 // planes : member planes of this configuration. On input empty.
2903 //
2904 // Output :
2905 // planes : contains the planes which are defining the configuration
2906 //
2907 // Detailed description
2908 //
2909 // Here is the list of seeding planes configurations together with
2910 // their topological classification:
2911 //
2912 // 0 - 5432 TQ 0
2913 // 1 - 4321 TQ 0
2914 // 2 - 3210 TQ 0
2915 // 3 - 5321 TQ 1
2916 // 4 - 4210 TQ 1
2917 // 5 - 5431 TQ 1
2918 // 6 - 4320 TQ 1
2919 // 7 - 5430 TQ 2
2920 // 8 - 5210 TQ 2
2921 // 9 - 5421 TQ 3
2922 // 10 - 4310 TQ 3
2923 // 11 - 5410 TQ 4
2924 // 12 - 5420 TQ 5
2925 // 13 - 5320 TQ 5
2926 // 14 - 5310 TQ 5
2927 //
2928 // The topologic quality is modeled as follows:
2929 // 1. The general model is define by the equation:
2930 // p(conf) = exp(-conf/2)
2931 // 2. According to the topologic classification, configurations from the same
2932 // class are assigned the agerage value over the model values.
2933 // 3. Quality values are normalized.
2934 //
2935 // The topologic quality distribution as function of configuration is given below:
2936 //Begin_Html
2937 // <img src="gif/topologicQA.gif">
2938 //End_Html
2939 //
2940
2941 switch(iconfig){
2942 case 0: // 5432 TQ 0
2943 planes[0] = 2;
2944 planes[1] = 3;
2945 planes[2] = 4;
2946 planes[3] = 5;
2947 break;
2948 case 1: // 4321 TQ 0
2949 planes[0] = 1;
2950 planes[1] = 2;
2951 planes[2] = 3;
2952 planes[3] = 4;
2953 break;
2954 case 2: // 3210 TQ 0
2955 planes[0] = 0;
2956 planes[1] = 1;
2957 planes[2] = 2;
2958 planes[3] = 3;
2959 break;
2960 case 3: // 5321 TQ 1
2961 planes[0] = 1;
2962 planes[1] = 2;
2963 planes[2] = 3;
2964 planes[3] = 5;
2965 break;
2966 case 4: // 4210 TQ 1
2967 planes[0] = 0;
2968 planes[1] = 1;
2969 planes[2] = 2;
2970 planes[3] = 4;
2971 break;
2972 case 5: // 5431 TQ 1
2973 planes[0] = 1;
2974 planes[1] = 3;
2975 planes[2] = 4;
2976 planes[3] = 5;
2977 break;
2978 case 6: // 4320 TQ 1
2979 planes[0] = 0;
2980 planes[1] = 2;
2981 planes[2] = 3;
2982 planes[3] = 4;
2983 break;
2984 case 7: // 5430 TQ 2
2985 planes[0] = 0;
2986 planes[1] = 3;
2987 planes[2] = 4;
2988 planes[3] = 5;
2989 break;
2990 case 8: // 5210 TQ 2
2991 planes[0] = 0;
2992 planes[1] = 1;
2993 planes[2] = 2;
2994 planes[3] = 5;
2995 break;
2996 case 9: // 5421 TQ 3
2997 planes[0] = 1;
2998 planes[1] = 2;
2999 planes[2] = 4;
3000 planes[3] = 5;
3001 break;
3002 case 10: // 4310 TQ 3
3003 planes[0] = 0;
3004 planes[1] = 1;
3005 planes[2] = 3;
3006 planes[3] = 4;
3007 break;
3008 case 11: // 5410 TQ 4
3009 planes[0] = 0;
3010 planes[1] = 1;
3011 planes[2] = 4;
3012 planes[3] = 5;
3013 break;
3014 case 12: // 5420 TQ 5
3015 planes[0] = 0;
3016 planes[1] = 2;
3017 planes[2] = 4;
3018 planes[3] = 5;
3019 break;
3020 case 13: // 5320 TQ 5
3021 planes[0] = 0;
3022 planes[1] = 2;
3023 planes[2] = 3;
3024 planes[3] = 5;
3025 break;
3026 case 14: // 5310 TQ 5
3027 planes[0] = 0;
3028 planes[1] = 1;
3029 planes[2] = 3;
3030 planes[3] = 5;
3031 break;
3032 }
e4f2f73d 3033}
3034
3035//____________________________________________________________________
0906e73e 3036void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3037{
41702fec 3038 //
3039 // Returns the extrapolation planes for a seeding configuration.
3040 //
3041 // Parameters :
3042 // iconfig : configuration index
3043 // planes : planes which are not in this configuration. On input empty.
3044 //
3045 // Output :
3046 // planes : contains the planes which are not in the configuration
3047 //
3048 // Detailed description
3049 //
3050
3051 switch(iconfig){
3052 case 0: // 5432 TQ 0
3053 planes[0] = 1;
3054 planes[1] = 0;
3055 break;
3056 case 1: // 4321 TQ 0
3057 planes[0] = 5;
3058 planes[1] = 0;
3059 break;
3060 case 2: // 3210 TQ 0
3061 planes[0] = 4;
3062 planes[1] = 5;
3063 break;
3064 case 3: // 5321 TQ 1
3065 planes[0] = 4;
3066 planes[1] = 0;
3067 break;
3068 case 4: // 4210 TQ 1
3069 planes[0] = 5;
3070 planes[1] = 3;
3071 break;
3072 case 5: // 5431 TQ 1
3073 planes[0] = 2;
3074 planes[1] = 0;
3075 break;
3076 case 6: // 4320 TQ 1
3077 planes[0] = 5;
3078 planes[1] = 1;
3079 break;
3080 case 7: // 5430 TQ 2
3081 planes[0] = 2;
3082 planes[1] = 1;
3083 break;
3084 case 8: // 5210 TQ 2
3085 planes[0] = 4;
3086 planes[1] = 3;
3087 break;
3088 case 9: // 5421 TQ 3
3089 planes[0] = 3;
3090 planes[1] = 0;
3091 break;
3092 case 10: // 4310 TQ 3
3093 planes[0] = 5;
3094 planes[1] = 2;
3095 break;
3096 case 11: // 5410 TQ 4
3097 planes[0] = 3;
3098 planes[1] = 2;
3099 break;
3100 case 12: // 5420 TQ 5
3101 planes[0] = 3;
3102 planes[1] = 1;
3103 break;
3104 case 13: // 5320 TQ 5
3105 planes[0] = 4;
3106 planes[1] = 1;
3107 break;
3108 case 14: // 5310 TQ 5
3109 planes[0] = 4;
3110 planes[1] = 2;
3111 break;
3112 }
e4f2f73d 3113}
eb38ed55 3114
3115//____________________________________________________________________
3116AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3117{
41702fec 3118 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3119 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3120}
3121
bb56afff 3122//____________________________________________________________________
3b57a3f7 3123AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3124{
41702fec 3125 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3126 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3127}
3128
3129//____________________________________________________________________
3130AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3131{
41702fec 3132 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3133 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3134}
3135
3136//____________________________________________________________________
bb56afff 3137Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3138 //
3139 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3140 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3141 // are taken into account
3142 //
3143 // Parameters: - Array of tracklets(AliTRDseedV1)
3144 //
3145 // Output: - The reference x-position(Float_t)
3146 //
3147 Int_t nDistances = 0;
3148 Float_t meanDistance = 0.;
3149 Int_t startIndex = 5;
3150 for(Int_t il =5; il > 0; il--){
3151 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3152 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3153 meanDistance += xdiff;
3154 nDistances++;
3155 }
3156 if(tracklets[il].IsOK()) startIndex = il;
3157 }
3158 if(tracklets[0].IsOK()) startIndex = 0;
3159 if(!nDistances){
3160 // We should normally never get here
3161 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3162 Int_t iok = 0, idiff = 0;
3163 // This attempt is worse and should be avoided:
3164 // check for two chambers which are OK and repeat this without taking the mean value
3165 // Strategy avoids a division by 0;
3166 for(Int_t il = 5; il >= 0; il--){
3167 if(tracklets[il].IsOK()){
3168 xpos[iok] = tracklets[il].GetX0();
3169 iok++;
3170 startIndex = il;
3171 }
3172 if(iok) idiff++; // to get the right difference;
3173 if(iok > 1) break;
3174 }
3175 if(iok > 1){
3176 meanDistance = (xpos[0] - xpos[1])/idiff;
3177 }
3178 else{
3179 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3180 return 331.;
3181 }
3182 }
3183 else{
3184 meanDistance /= nDistances;
3185 }
3186 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3187}
eb38ed55 3188
3189//_____________________________________________________________________________
3190Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
41702fec 3191 , Int_t *outlist, Bool_t down)
eb38ed55 3192{
41702fec 3193 //
3194 // Sort eleements according occurancy
3195 // The size of output array has is 2*n
3196 //
3197
3198 if (n <= 0) {
3199 return 0;
3200 }
3201
3202 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3203 Int_t *sindexF = new Int_t[2*n];
3204 for (Int_t i = 0; i < n; i++) {
3205 sindexF[i] = 0;
3206 }
3207
3208 TMath::Sort(n,inlist,sindexS,down);
3209
3210 Int_t last = inlist[sindexS[0]];
3211 Int_t val = last;
3212 sindexF[0] = 1;
3213 sindexF[0+n] = last;
3214 Int_t countPos = 0;
3215
3216 // Find frequency
3217 for (Int_t i = 1; i < n; i++) {
3218 val = inlist[sindexS[i]];
3219 if (last == val) {
3220 sindexF[countPos]++;
3221 }
3222 else {
3223 countPos++;
3224 sindexF[countPos+n] = val;
3225 sindexF[countPos]++;
3226 last = val;
3227 }
3228 }
3229 if (last == val) {
3230 countPos++;
3231 }
3232
3233 // Sort according frequency
3234 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3235
3236 for (Int_t i = 0; i < countPos; i++) {
3237 outlist[2*i ] = sindexF[sindexS[i]+n];
3238 outlist[2*i+1] = sindexF[sindexS[i]];
3239 }
3240
3241 delete [] sindexS;
3242 delete [] sindexF;
3243
3244 return countPos;
eb38ed55 3245
3246}
bb56afff 3247
06b32d95 3248
3249//____________________________________________________________________
acd241e9 3250
bb56afff 3251//_____________________________________________________________________________
3252Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3253{
41702fec 3254 // Chi2 definition on y-direction
3255
3256 Float_t chi2 = 0;
3257 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3258 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3259 Double_t distLayer = (tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0));// /tracklets[ipl].GetSigmaY();
41702fec 3260 chi2 += distLayer * distLayer;
3261 }
3262 return chi2;
bb56afff 3263}
3264
d611c74f 3265//____________________________________________________________________
3266void AliTRDtrackerV1::ResetSeedTB()
3267{
3268// reset buffer for seeding time bin layers. If the time bin
3269// layers are not allocated this function allocates them
3270
3271 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3272 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3273 else fSeedTB[isl]->Clear();
3274 }
3275}
3276
bb56afff 3277//_____________________________________________________________________________
3278Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3279{
91834b8d 3280 // Calculates normalized chi2 in z-direction
41702fec 3281
3282 Float_t chi2 = 0;
91834b8d 3283 // chi2 = Sum ((z - zmu)/sigma)^2
3284 // Sigma for the z direction is defined as half of the padlength
41702fec 3285 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3286 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3287 Double_t distLayer = (tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0)); // /(tracklets[ipl].GetPadLength()/2);
41702fec 3288 chi2 += distLayer * distLayer;
3289 }
3290 return chi2;
bb56afff 3291}
8acca6a3 3292
3293///////////////////////////////////////////////////////
3294// //
3295// Resources of class AliTRDLeastSquare //
3296// //
3297///////////////////////////////////////////////////////
3298
3299//_____________________________________________________________________________
3300AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3301 //
3302 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3303 //
3304 memset(fParams, 0, sizeof(Double_t) * 2);
3305 memset(fSums, 0, sizeof(Double_t) * 5);
3306 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3307
3308}
3309
3310//_____________________________________________________________________________
3311void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3312 //
3313 // Adding Point to the fitter
3314 //
3315 Double_t weight = 1/(sigmaY * sigmaY);
3316 Double_t &xpt = *x;
3317 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3318 fSums[0] += weight;
3319 fSums[1] += weight * xpt;
3320 fSums[2] += weight * y;
3321 fSums[3] += weight * xpt * y;
3322 fSums[4] += weight * xpt * xpt;
3323 fSums[5] += weight * y * y;
8acca6a3 3324}
3325
3326//_____________________________________________________________________________
3327void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3328 //
3329 // Remove Point from the sample
3330 //
3331 Double_t weight = 1/(sigmaY * sigmaY);
3332 Double_t &xpt = *x;
3333 fSums[0] -= weight;
3334 fSums[1] -= weight * xpt;
3335 fSums[2] -= weight * y;
3336 fSums[3] -= weight * xpt * y;
3337 fSums[4] -= weight * xpt * xpt;
3338 fSums[5] -= weight * y * y;
8acca6a3 3339}
3340
3341//_____________________________________________________________________________
3342void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3343 //
3344 // Evaluation of the fit:
3345 // Calculation of the parameters
3346 // Calculation of the covariance matrix
3347 //
3348
3349 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3350 if(denominator==0) return;
3351
41702fec 3352 // for(Int_t isum = 0; isum < 5; isum++)
3353 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3354 // printf("denominator = %f\n", denominator);
3355 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3356 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3357 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3358
3359 // Covariance matrix
3360 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3361 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3362 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3363}
3364
46b6abd7 3365//_____________________________________________________________________________
3366Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3367 //
3368 // Returns the Function value of the fitted function at a given x-position
3369 //
3370 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3371}
3372
3373//_____________________________________________________________________________
3374void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3375 //
3376 // Copies the values of the covariance matrix into the storage
3377 //
3378 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3379}
3380